package com.czb.server.config;

import com.czb.server.config.security.component.JwtTokenUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.simp.config.ChannelRegistration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.support.ChannelInterceptor;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.util.StringUtils;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
import springfox.documentation.spi.service.contexts.SecurityContext;

@Configuration
@EnableWebSocketMessageBroker
public class webSocketConfig implements WebSocketMessageBrokerConfigurer {

    @Value("${jwt.tokenHead}")
    private String tokenHead;

    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @Autowired
    private UserDetailsService userDetailsService;

    /**
     * 添加这个endPoint，这样在网页可以通过webSocket连接上服务
     * 也就是我们配置webSocket的服务地址，并且可以指定是否使用socketJS
     * @param registry
     */
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        /**
         * 1.将ws/ep路径注册为stomp的端点，用户连接了这个端点就可以进行webSocket通讯，支持websocketJs
         * 2.setAllowedOrigins允许跨域
         * 3.withSockJS:允许使用websocketJS访问
         */
        registry.addEndpoint("/ws/ep").setAllowedOrigins("*").withSockJS();
    }

    @Override
    public void configureClientInboundChannel(ChannelRegistration registration) {
        registration.interceptors(new ChannelInterceptor() {
            @Override
            public Message<?> preSend(Message<?> message, MessageChannel channel) {
                StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);

                //判断是否为连接，如果是，需要获取token，并且设置用户独享
                if (StompCommand.CONNECT.equals(accessor.getCommand())){
                    String token=accessor.getFirstNativeHeader("Auth-token");
                    if (!StringUtils.isEmpty(token)){
                        String authToken = token.substring(tokenHead.length());
                        String username = jwtTokenUtil.getUsernameByToken(authToken);

                        if (!StringUtils.isEmpty(username)){
                            UserDetails userDetails = userDetailsService.loadUserByUsername(username);
                            if (jwtTokenUtil.isValidateToken(authToken,userDetails)){
                                UsernamePasswordAuthenticationToken authenticationToken=new UsernamePasswordAuthenticationToken(userDetails,null,userDetails.getAuthorities());
                                SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                                accessor.setUser(authenticationToken);
                            }
                        }
                    }
                }
                return message;
            }
        });
    }

    /**
     * 配置消费代理
     * @param registry
     */
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        //配置代理域，可以配置多个，配置代理目的地前缀为queue，可以在配置域上向客户端发送消息
        registry.enableSimpleBroker("/queue");
    }
}
